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micomaco86572
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If our spacetime has torsion, will it violate the conservation of angular momentum?
Thx
Thx
micomaco86572 said:If our spacetime has torsion, will it violate the conservation of angular momentum?
Thx
Why would non-zero torsion violate the principle of relativity? Are you saying measurements validating the principle of relativity can, in principle, rule out Einstein-Cartan gravity?Dickfore said:According to the principle of Relativity, it must be zero.
JustinLevy said:Why would non-zero torsion violate the principle of relativity? Are you saying measurements validating the principle of relativity can, in principle, rule out Einstein-Cartan gravity?
micomaco86572 said:In GR, the spacetime is Riemann manifold, with zero torsion. But it is just a assumption. If there is not some experimental fact conflict with the torsion , we still cannot rule out the spacetime with torsion which is called Riemann Cartan manifold.
People introduce this assumption for what? Just for simplification? (forgive my poor English,:) )
In examining the transformation of [itex said:\Gamma[/itex], it is apparent that it is symmetric in its lower indices. I won't post the transformation equation that shows this because it's too much work to get all this Latex correct, though it's apparent that it is unchanged upon interchange of the lower indices.
micomaco86572 said:I am sorry, Phrak. I cannot prove the symmetry of the lower indices. Can u tell me some details. Thx a lot.
Torsion is the twisting of an object due to an applied torque. It is a type of rotational deformation that occurs when a force is applied to an object, causing it to rotate about its axis.
Torsion does not affect the conservation of angular momentum. According to the law of conservation of angular momentum, the total angular momentum of a system remains constant, even if torsion is present. This means that the total amount of rotational motion in a system will remain the same, regardless of any twisting forces acting on the system.
Yes, torsion can be used to change the direction of angular momentum. When a torque is applied to an object, it causes the object to rotate, which changes the direction of its angular momentum. However, the total amount of angular momentum in the system will always remain constant.
Torque and angular momentum are directly related to each other. Torque is the force that causes an object to rotate, and it is directly proportional to the rate of change of angular momentum. This means that the greater the torque applied to an object, the faster its angular momentum will change.
The conservation of angular momentum is applied in various real-world situations, such as in the movement of objects in space, the motion of spinning tops, and the flight of a frisbee. It is also used in engineering and design, such as in the construction of rotating machinery and vehicles with spinning wheels.